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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
Effects of N-glycan processing inhibitors on signaling events and induction of apoptosis in galectin-1-stimulated Jurkat T lymphocytes.
To elucidate the role of N-linked glycans in triggering T-cell functions, the effects of the N-glycan processing inhibitors 1-deoxymannojirimycin (1-DMM) and swainsonine (SW) were investigated on signaling events and induction of apoptosis in galectin-1 (gal-1)-stimulated Jurkat T lymphocytes. The treatment of Jurkat E6.1 cells with 1-DMM and SW strongly reduced the cell binding of gal-1-biotin, conjugate binding to cell lysate glycoproteins, and to cluster of differentiation (CD) 3 immunoprecipitates on blots as well as the binding of CD2 and CD3 to immobilized gal-1. The mannosidase inhibitors efficiently decreased gal-1-induced calcium mobilization. Both phases originated from a transient Ca(2+) release of internal stores, and the sustained influx across the plasma membrane was found to be involved. Both inhibitors suppressed in transiently transfected Jurkat T lymphocytes the gal-1-induced expression of the luciferase (luc) reporter gene constructs pNFAT-TA-Luc and pAP1(phorbol-12-myristate-13-acetate [PMA])-TA-Luc. The data provide evidence that gal-1 triggers through binding to N-linked glycans a Ca(2+)-sensitive apoptotic pathway.[1]
